Color filter with color conversion function, producing method thereof, and organic el display

Abstract

A filter and a display employing a color conversion mode that can simplify production, achieve high definition patterning, and enhance color conversion efficiency for every primary color is disclosed. A color filter with color conversion function includes a transparent substrate, a plurality types of color filter layers disposed on the transparent substrate, and a color conversion layer containing at least one color conversion material and disposed in one-piece over the color filter layers. At least one of the color conversion materials absorbs a wavelength region of incident light and emits light in different wavelength region from the absorbed wavelength region, and a region in the color conversion layer of passage of the incident light to one color filter layer exhibits higher light transmissivity to the incident light than regions in the color conversion layer of passage of the incident light to the other color filter layers.

1 . A color filter with color conversion function comprising: 
 a transparent substrate;    plural types of color filter layers disposed on the transparent substrate; and    a color conversion layer containing at least one color conversion material and disposed in one-piece over the color filter layers;    wherein at least one of the color conversion materials absorbs a wavelength region of incident light and emits light in a different wavelength region from the absorbed wavelength region, and    a region in the color conversion layer of passage of the incident light towards one color filter layer exhibits higher light transmissivity to the incident light than other regions in the color conversion layer of passage of the incident light towards the other color filter layers.    
   
   
       2 . The color filter according to  claim 1 , wherein at least a portion of the color conversion materials in the region of passage of incident light exhibiting higher light transmissivity is photo-bleached.  
   
   
       3 . The color filter according to  claim 1 , wherein the color conversion layer is formed in one-piece covering the color filter layers.  
   
   
       4 . The color filter according to  claim 1 , wherein the incident light to the color conversion layer is light in a blue to blue-green color region, and at least one of the color conversion materials emits light having a spectrum containing a red color region.  
   
   
       5 . The color filter according to  claim 4 , wherein the plural types of color filter layers are a red color filter layer, a green color filter layer, and a blue color filter layer, and a region of passage of the incident light to the blue color filter layer and a region of passage of the incident light to the green color filter layer exhibit higher light transmissivity to the incident light than a region of passage of the incident light to the red color filter layer.  
   
   
       6 . The color filter according to  claim 1 , wherein the color conversion layer comprises a matrix resin and the at least one color conversion material dispersed in the matrix resin.  
   
   
       7 . The color filter according to  claim 1 , further comprising a gas barrier layer covering the color conversion layer.  
   
   
       8 . An organic EL display comprising: 
 a transparent substrate;    plural types of color filter layers disposed on the transparent substrate;    a color conversion layer containing at least one color conversion material and disposed in one-piece over the color filter layers, wherein at least one of the color conversion materials absorbs a wavelength region of incident light and emits light in different wavelength region from the absorbed wavelength region, and a region in the color conversion layer of passage of the incident light towards one color filter layer exhibits higher light transmissivity to the incident light than other regions in the color conversion layer of passage of the incident light towards the other color filter layers;    a transparent first electrode disposed opposite the color filter layers across the color conversion layer;    an organic EL layer containing at least an organic light emitting layer disposed opposite the color conversion layers across the transparent first electrode; and    a second electrode disposed opposite the transparent first electrode across the organic EL layer.    
   
   
       9 . The organic EL display according to  claim 8 , comprising a color filter with color conversion function that includes the transparent substrate, the plurality types of color filter layers, and the color conversion layer.  
   
   
       10 . The organic EL display according to  claim 8 , comprising an organic EL device with color conversion function that includes the color conversion layer, the transparent first electrode, the organic EL layer, and the second electrode.  
   
   
       11 . The organic EL display according to  claim 8 , wherein the color conversion layer contains at least two types of color conversion materials.  
   
   
       12 . The organic EL display according to  claim 8 , wherein the color conversion layer is a film formed by means of an evaporation method.  
   
   
       13 . The organic EL display according to  claim 8 , wherein a thickness of the color conversion layer is at most 2,000 nm.  
   
   
       14 . A method of producing a color filter with color conversion function comprising: 
 fabricating an intermediate color filter that comprises a transparent substrate, plural types of color filter layers disposed on the transparent substrate, and a color conversion layer containing at least one color conversion material and disposed over the color filter layers, wherein at least one of the color conversion materials absorbs a wavelength region of incident light and emits light in different wavelength region from the absorbed wavelength region; and    photo-bleaching at least one color conversion material in a region in the color conversion layer of passage of an incident light towards one type of the color filter layers.    
   
   
       15 . The method according to  claim 14 , wherein the photo-bleaching includes a process of irradiating electromagnetic wave onto the region of passage of the incident light in the intermediate color filter.